Magnetic and dielectric study of R0.5Sr0.5MnO 3 (R = Gd, Tb and Dy)

Kenji Yoshii; Yusuke Hiramitsu; Yuka Okajima; Yasuhiro Yoneda; Yasuo Nishihata; Jun'Ichiro Mizuki; Akio Nakamura; Yutaka Shimojo; Yoshinobu Ishii; Yukio Morii; Naoshi Ikeda

doi:10.1016/j.materresbull.2010.07.024

Magnetic and dielectric study of R_0.5Sr_0.5MnO ₃ (R = Gd, Tb and Dy)

Kenji Yoshii, Yusuke Hiramitsu, Yuka Okajima, Yasuhiro Yoneda, Yasuo Nishihata, Jun'Ichiro Mizuki, Akio Nakamura, Yutaka Shimojo, Yoshinobu Ishii, Yukio Morii, Naoshi Ikeda

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Magnetic and dielectric properties of perovskite manganites R _0.5Sr_0.5MnO₃ (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at T_g ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R³⁺ and Sr ³⁺ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above T_g. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.

Original language	English
Pages (from-to)	1574-1580
Number of pages	7
Journal	Materials Research Bulletin
Volume	45
Issue number	11
DOIs	https://doi.org/10.1016/j.materresbull.2010.07.024
Publication status	Published - Nov 2010

Keywords

A. Oxides
C. Neutron scattering
D. Dielectric properties
D. Magnetic properties
E. EXAFS

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.materresbull.2010.07.024

Cite this

Magnetic and dielectric study of R_0.5Sr_0.5MnO ₃ (R = Gd, Tb and Dy). / Yoshii, Kenji; Hiramitsu, Yusuke; Okajima, Yuka; Yoneda, Yasuhiro; Nishihata, Yasuo; Mizuki, Jun'Ichiro; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu; Morii, Yukio; Ikeda, Naoshi.

In: Materials Research Bulletin, Vol. 45, No. 11, 11.2010, p. 1574-1580.

Research output: Contribution to journal › Article › peer-review

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AU - Yoneda, Yasuhiro

AU - Nishihata, Yasuo

AU - Mizuki, Jun'Ichiro

AU - Nakamura, Akio

AU - Shimojo, Yutaka

AU - Ishii, Yoshinobu

AU - Morii, Yukio

AU - Ikeda, Naoshi

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AB - Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.

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